άβακας, μετρώ, μαθηματικά, υπολογιστικών βοηθημάτων, ξύλινες μπάλες, μαθαίνω, παιχνίδια, ξύλο, λογαριθμικός κανόνας, σχολείο, spiegelung
Public Domain
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